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Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningEngine Oil Life System
The engine oil life system calculates engine oil life based on vehicle use and
displays the CHANGE ENGINE OIL SOON DIC message or Code 82 DIC message when it is
necessary to change the engine oil and filter.
Remember, the Oil Life display must be reset after each oil change. It will not
reset ...
Installation Procedure
Align the body side outer panel reinforcement.
Clean and prepare the attaching surfaces for welding.
Position the body side outer panel
reinforcement on the vehicle.
Verify the fit of the body side outer panel reinforcement.
Clamp the body side outer panel reinforcement ...
Rear Suspension Description and Operation
This vehicle has a semi-independent twist-beam rear suspension system
consisting of the following components:
An axle with integral trailing arms
AV shaped twisting cross beam
Two coil springs
Two shock absorbers
Axle Assembly
The axle assembly (1) attaches to the underbody throu ...